In a letter to the UN, South African Minister for Women, Children and People with Disabilities states that the questioning of Caster Semenya’s gender is based on a stereotypical view of physical features and abilities attributable to women, and demonstrates the extent of patriarchy within the world’s sporting community.

Testing 18-year-old South African athlete Caster Semenya to determine
whether or not she is female is the latest demonstration of the way
societies are unable to accept that gender is fluid and people are not
always "one or the other."